Mouse Themed Wallpapers. A mouse is a rodent. A small rodent to be more precise and they are also referred to as pests by some people. There are different type of mouse breeds however and depending on the breed, they may also be taken care of by people. While some people find them disgusting because of what they can do to the home or how easily they breed, you may have an appreciation of the mouse because of your own personal reasons. This desktop theme can help you showcase your love for the mouse as the image depicts a mouse trying to cross over with the use of dainty plant branches. When you look at this wallpaper, you cannot help but think that they still look cute.